Which is the Tallest Mountain?

Mt McKinley in Alaska may be the tallest mountain on Earth. But didn’t you learn that Earth’s tallest mountain is Mount Everest? It turns out that the question of tallness is a difficult question to answer.

Why Isn’t Mount Everest the Tallest Mountain?

It’s true that Mount Everest rises the highest above sea level at 29,029 feet (8848 m). But that’s only if you measure tallness as height above sea level. Could tallness be measured in other ways? There is a case to be made for at least two other mountains being the tallest. And that’s just on Earth. What’s the tallest mountain in the solar system? The answer to that question is a big surprise.